The CX18 AT from IQD Frequency Products is a RF Quartz Crystal with Frequency 30 to 50 MHz, Frequency Stability ±10 to ±100 ppm, Frequency Tolerance ±30 to ±50 ppm, Drive Power Level 100 µW, Load Capacitance 9 pF. Tags: Surface Mount, Ceramic. More details for CX18 AT can be seen below.